The dynamic analysis of dimethyl phthalate in electro-fenton degradation process and determination of dimethyl phthalate residues in beverages based on solid-phase microextraction

Dimethyl phthalate (DMP) is widely used as a plasticizer in the plastics industry, posing a serious threat to environmental pollution and public health. In this work, CuFe 2 O 4 @AC was used as a coating to prepare a novel solid-phase microextraction (SPME) fiber. CuFe 2 O 4 @AC fiber exhibits a larger specific surface area and more active sites, significantly enhancing DMP enrichment efficiency. The SPME method was applied for DMP measurement in beverages. Under optimal conditions, the developed method demonstrates a low detection limit (0.07 ng mL −1 ), a wide linear range (0.5–1000 ng mL −1 ), and good repeatability. Subsequently, SPME method combined with electro-Fenton degradation was established. The degradation process of DMP was dynamically analyzed by combining DFT calculation with gas chromatography–mass spectrometry. We developed a dynamic analytical method for extracting and monitoring electro-Fenton degradation products. This approach demonstrates significant potential for monitoring the degradation process of trace environmental endocrine disruptors.